Naturalness, Vacuum Stability and Leptogenesis in the Minimal Seesaw Model

Understand

The right-handed neutrinos within the type-I seesaw mechanism can induce large radiative corrections to the Higgs mass, and naturalness arguments can then be used to set limits on their mass scale and Yukawa couplings.

• Driven by minimality, we consider the presence of two degenerate right-handed neutrinos.
• We compare the limits from naturalness with the ones from the stability of the electroweak vacuum and from lepton flavor violation.
• Implications from neutrinoless double beta decay are also discussed and renormalization effects for the light neutrino parameters are presented.